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SN75185N Datasheet(PDF) 9 Page - Texas Instruments |
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SN75185N Datasheet(HTML) 9 Page - Texas Instruments |
9 / 10 page SN75185 MULTIPLE RS-232 DRIVERS AND RECEIVERS SLLS181A – DECEMBER 1994 – REVISED NOVEMBER 1998 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Diodes placed in series with the VDD and VSS leads protect the SN75185 in the fault condition in which the device outputs are shorted to ±15 V and the power supplies are at low and provide low-impedance paths to ground (see Figure 15). VDD VSS ±15 V Output VDD VSS SN75185 SN75185 Figure 15. Power-Supply Protection to Meet Power-Off Fault Conditions of TIA / EIA-232-F 11 12 13 14 15 16 17 18 19 20 GND RY5 DA3 RY4 DA2 DA1 RY3 RY2 RY1 VCC VSS RA5 DY3 RA4 DY2 DY1 RA3 RA2 RA1 VDD 10 9 8 7 6 5 4 3 2 1 43 37 40 13 36 11 41 42 RI DTR CTS SO RTS SI DSR DCD R1 DTR CTS TX RTS RX DSR DCD SN75185 5 V TL16C450 ACE 1 5 6 9 12 V – 12 V TIA/EIA-232-F DB9S Connector C1† C3† † See Figure 10 to select the correct values for the loading capacitors (C1, C2, and C3), which are required to meet the RS-232 maximum slew-rate requirement of 30 V/ µs. The value of the loading capacitors required depends upon the line length and desired slew rate, but typically is 330 pF. C2† Figure 16. Typical Connection |
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